Methods for effective network-security inspection in virtualized environments

1. A method for effective network-security inspection of virtual traffic over a network, in virtualized environments, the method comprising the steps of: (a) providing a data packet, embodied in machine-readable signals, being sent from a sending virtual machine to a receiving virtual machine via a virtual switch; (b) intercepting said data packet by a sending security agent associated with said sending virtual machine; (c) injecting said data packet into an inspecting security agent associated with a security virtual machine via a direct transmission channel which bypasses said virtual switch; (d) forwarding said data packet to said security virtual machine by a network interface card (NIC), said forwarding by said NIC including buffering and aggregating packets to increase performance of data packet traffic over said network; (e) determining, by said security virtual machine, whether said data packet is allowed for transmission; (f) upon determining said data packet is allowed, injecting said data packet back into said sending security agent via said direct transmission channel; (g) forwarding said data packet to said receiving virtual machine via said virtual switch; and, (h) prior to said step (f), upon determining said data packet is allowed, tagging said data packet as a security-cleared packet; and wherein said step (g) includes: (i) intercepting said security-cleared packet by a receiving security agent associated with said receiving virtual machine; (ii) inspecting, by said receiving security agent, whether an incoming packet has a security-cleared tag; (iii) upon determining said incoming packet has said security-cleared tag, transmitting said incoming packet to said receiving virtual machine; (iv) upon determining said incoming packet does not have said security-cleared tag, forwarding said incoming packet to said security virtual machine; and, (v) performing said steps (e)-(g) on said incoming packet.

2. The method of claim 1 , wherein said security virtual machine includes at least one security component selected from the group consisting of: a firewall, an Intrusion Prevention System (IPS), an Intrusion Detection System (IDS), a Data-Loss Prevention DLP) system, a Virtual Private Network (VPN), a Uniform Resource Locator (URL) filter, a malware filter, and a web filter.

3. The method of claim 1 , wherein said packet-forwarding mechanism is a standard packet-transmittal mechanism provided by a hypervisor virtualization infrastructure.

4. The method of claim 1 , wherein said packet-forwarding mechanism is a direct interface into said security virtual machine.

5. The method of claim 4 , wherein said direct interface is configured to utilize a component selected from the group consisting of: a memory module, a cache memory module, and an associated network interface card (NIC) resource.

6. The method of claim 1 , wherein said sending virtual machine and said receiving virtual machine share a common physical machine.

7. The method of claim 1 , the method further comprising the steps of: (i) prior to said step (c), determining, by said sending security agent, whether said data packet is allowed for transmission; (j) implementing a security-processing mechanism, by said sending security agent, on said data packet; (k) by said sending security agent: upon determining said data packet needs further security processing, continuing to said step (c); (l) by said sending security agent: upon determining said data packet is not allowed, dropping said data packet; and (m) by said sending security agent: upon determining said data packet is allowed, continuing to said step (g).

8. A non-transitory computer-readable storage medium having computer-readable code embodied on the computer-readable storage medium, the computer-readable code comprising: (a) program code for intercepting a data packet embodied in machine-readable signals, transmitted over a network, said data packet being sent from a sending virtual machine to a receiving virtual machine, by a sending security agent associated with said sending virtual machine via a virtual switch; (b) program code for injecting said data packet into an inspecting security agent associated with a security virtual machine via a direct transmission channel which bypasses said virtual switch; (c) program code for causing forwarding of said data packet to said security virtual machine by a network interface card (NIC), said forwarding by said NIC including buffering and aggregating packets to increase performance of data packet traffic over said network; (d) program code for determining, by said security virtual machine, whether said data packet is allowed for transmission; (e) program code for, upon determining said data packet is allowed, injecting said data packet back into said sending security agent via said direct transmission channel; (f) program code for forwarding said data packet to said receiving virtual machine via said virtual switch; and, (g) program code for, prior to executing said program code (e), upon determining said data packet is allowed, tagging said data packet as a security-cleared packet; and wherein said program code (f) further includes: (i) program code for intercepting said security-cleared packet by a receiving security agent associated with said receiving virtual machine; (ii) program code for inspecting, by said receiving security agent, whether an incoming packet has a security-cleared tag; (iii) program code for, upon determining said incoming packet has said security-cleared tag, transmitting said incoming packet to said receiving virtual machine; (iv) program code for, upon determining said incoming packet does not have said security-cleared tag, forwarding said incoming packet to said security virtual machine; and (v) program code for performing said program code (d)-(f) on said incoming packet.

9. The storage medium of claim 8 , wherein said security virtual machine includes at least one security component selected from the group consisting of: a firewall, an Intrusion Prevention System (IPS), an Intrusion Detection System (IDS), a Data-Loss Prevention (DLP) system, a Virtual Private Network (VPN), a Uniform Resource Locator (URL) filter, a malware filter, and a web filter.

10. The storage medium of claim 8 , wherein said packet-forwarding mechanism is a standard packet-transmittal mechanism provided by a hypervisor virtualization infrastructure.

11. The storage medium of claim 8 , wherein said packet-forwarding mechanism is a direct interface into said security virtual machine.

12. The storage medium of claim 11 , wherein said direct interface is configured to utilize a component selected from the group consisting of: a memory module, a cache memory module, and an associated network interface card (NIC) resource.

13. The storage medium of claim 8 , wherein said sending virtual machine and said receiving virtual machine share a common physical machine.

14. The storage medium of claim 8 , the computer-readable code further comprising: (h) program code for, prior to said program code (b), determining, by said sending security agent, whether said data packet is allowed for transmission; (i) program code for, implementing a security-processing mechanism, by said sending security agent, on said data packet; (j) program code for, by said sending security agent: upon determining said data packet needs further security processing, continuing to said program code (b); (k) program code for, by said sending security agent: upon determining said data packet is not allowed, dropping said data packet; and (l) program code for, by said sending security agent: upon determining said data packet is allowed, continuing to said program code (f).